wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
if (result = 79) | if (result == 79) | Use ==. | Scala |
local count = 54 | local count = 54 | Correct. | Lua |
<a href='https://example.com' target='_blank'> | <a href='https://example.com' target='_blank' rel='noopener'> | Add rel for security. | HTML |
<person><name>world</name><desc>47</desc></person | <person><name>world</name><desc>47</desc></person> | Add closing >. | XML |
val b = 91; b = 55 | var b = 91; b = 55 | Use var for reassignment. | Scala |
Write-Host 'data' | Write-Host 'data' | Correct. | PowerShell |
assert num > 53 | assert num > 53 | Correct. | Python |
class Person
def method
end
end | class Person
def method
end
end | Correct. | Ruby |
if c = 20 {{}} | if c == 20 {{}} | Use ==. | Swift |
if (val = 31) | if (val == 31) | Use ==. | R |
int temp = 'test'; | String temp = 'test'; | Type mismatch. | Dart |
for (int i=0; i<82; i++) {{}} | for (int i=0; i<82; i++) {{}} | Correct. | Java |
function bar(bar:string){{return bar;}} bar(63); | function bar(bar:string){{return bar;}} bar('test'); | Pass correct type. | TypeScript |
{{'value':'test'}} | {{"value":"test"}} | Use double quotes. | JSON |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let foo = 11; foo += 1; | let mut foo = 11; foo += 1; | Need mut to modify. | Rust |
console.log('message' | console.log('message') | Close parenthesis. | JavaScript |
x := 33 | x := 33 | Correct. | Go |
INSERT INTO users VALUES ('message',9) | INSERT INTO users (age, email) VALUES ('message',9); | Specify columns. | SQL |
void main() {{ print('message') }} | void main() {{ print('message'); }} | Add semicolon. | Dart |
ArrayList list = new ArrayList(); | ArrayList<String> list = new ArrayList<>(); | Use generics. | Java |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(36); | const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('result')); app.listen(36, () => console.log('listening')); | Add callback. | Node.js |
<note name='world'/> | <note name="world"/> | Double quotes. | XML |
List(94,41,39) | List(94,41,39) | Correct. | Scala |
data(39) | if length(data) >= 39, data(39), end | Check length. | MATLAB |
List<int> list = [1,2,3]; | List<int> list = [1,2,3]; | Correct. | Dart |
name: info
age: 30 | name: info
age: 30 | Correct. | YAML |
cin >> result; | int result;
cin >> result; | Declare variable. | C++ |
'message' + 46 | 'message' + str(46) | Can't add int to string. | Python |
if z > 17
print('test') | if z > 17:
print('test') | Colon missing after if. | Python |
function foo(): void {{ return 83; }} | function foo(): number {{ return 83; }} | Return type mismatch. | TypeScript |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
if result = 62: | if result == 62: | Use == for comparison. | Python |
int* person = nullptr; *person=5; | int* person = new int; *person=5; | Allocate memory. | C++ |
fmt.Println 'result' | fmt.Println('result') | Missing parentheses. | Go |
if (c = 11) | if (c == 11) | Use ==. | C++ |
print 'info' | print 'info'; | Add semicolon. | Perl |
let result = 65; let result = 46; | let result = 65; result = 46; | Duplicate declaration. | JavaScript |
for (foo in arr) | for (foo of arr) | for...in iterates keys. | JavaScript |
if ($result = 42) {{}} | if ($result -eq 42) {{}} | Use -eq. | PowerShell |
DELETE FROM users WHERE status=79 | DELETE FROM users WHERE status=79; | Add semicolon. | SQL |
bar = 29 | bar=29 | No spaces. | Shell |
for i=1,37 do print(i) end | for i=1,37 do print(i) end | Correct. | Lua |
list[68] | if (length(list) >= 68) list[68] | Check length. | R |
status: value
title: hello, | status: value
title: hello | Remove comma. | YAML |
function compute() {{ echo 'world'; }} | function compute() {{ echo 'world'; }} | Correct. | PHP |
<div color=green> | <div style='color:green;'> | Use style attribute. | CSS |
{{'name':47, 'id' 38}} | {{'name':47, 'id':38}} | Colon missing. | Python |
if y = 76 | if y == 76 | Use ==. | MATLAB |
<?php
// code
?> | <?php
// code
?> | Correct. | PHP |
'60' + 56 | 60 + 56 | Avoid string coercion. | JavaScript |
let x: i32 = "result"; | let x: &str = "result"; | Type mismatch. | Rust |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
jwt.sign({{id:35}}, 'secret'); | jwt.sign({{id:35}}, 'secret', {{expiresIn:'7d'}}); | Add expiration. | Node.js |
def process
puts 'result'
end | def process
puts 'result'
end | Correct. | Ruby |
let a = 'hello' | let a = "hello" | Double quotes. | Swift |
if (foo = 2) {} | if (foo == 2) {} | Use ==. | Dart |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
class User {{ int data; }}; | class User {{ public: int data; }}; | Make public. | C++ |
JOIN products ON items.id = products.name | JOIN products ON items.id = products.name | Correct. | SQL |
@media screen {{ body {{}} }} | @media screen {{ body {{}} }} | Correct. | CSS |
if (temp = 7) {{}} | if (temp === 7) {{}} | Use === for equality. | JavaScript |
var x = 1; | var x = 1; | Correct. | Dart |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
print('hello') | print('hello') | Correct. | R |
raise 'test' | raise Exception('test') | Raise needs an exception class. | Python |
let str1 = String::from("message"); let s2 = str1; println!("{{}}", str1); | let str1 = String::from("message"); let s2 = str1.clone(); println!("{{}}", str1); | Clone to avoid move. | Rust |
let item: number = 'value'; | let item: string = 'value'; | Fix type. | TypeScript |
disp('message') | disp('message') | Correct. | MATLAB |
class = 'test' | class_name = 'test' | 'class' is a keyword. | Python |
SELECT COUNT(*) FROM items | SELECT COUNT(*) FROM items; | Missing semicolon. | SQL |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
switch(val){{ case 81: break; }} | switch(val){{ case 81: break; default: break; }} | Add default case. | Java |
div {{ color=blue; }} | div {{ color: blue; }} | Use colon. | CSS |
if [ $a = 53 ]; then | if [ "$a" = 53 ]; then | Quote variable. | Shell |
.Product {{ color: green; }} | .Product {{ color: green; }} | Correct. | CSS |
{{"id":"info" "age":95}} | {{"id":"info", "age":95}} | Add comma. | JSON |
data = world | data = 'world' | Quote strings. | Python |
else
print('data') | else:
print('data') | Colon after else. | Python |
val y: Int = 'world' | val y: String = 'world' | Fix type. | Kotlin |
print 'output' | print('output') | print needs parentheses. | Python |
list.forEach(function(data) {{ console.log(data); }}) | list.forEach((data) => {{ console.log(data); }}) | Arrow functions are cleaner. | JavaScript |
<hr></hr> | <hr> | Self-closing. | HTML |
{{"name":"result",}} | {{"name":"result"}} | Remove trailing comma. | JSON |
let b = 39; | let b = 39; | Correct. | JavaScript |
y == '61' | y === 61 | Use strict equality. | JavaScript |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
b > 92 & y < 31 | b > 92 and y < 31 | Use 'and' not '&'. | Python |
[41, 33, 87 | [41, 33, 87] | Close bracket. | Ruby |
for num in range(31)
print(num) | for num in range(31):
print(num) | Colon after for. | Python |
let temp: number | null = null; temp.toFixed(66); | let temp: number | null = null; if(temp!==null) temp.toFixed(66); | Null check. | TypeScript |
$x = 5; print $x | $x = 5; print $x; | Missing semicolon. | Perl |
["message", 20] | ["message", 20] | Correct. | JSON |
<p>info <b>hello</p></b> | <p>info <b>hello</b></p> | Nest properly. | HTML |
String c = 'world'; | String c = "world"; | Double quotes. | Java |
while temp > 75
temp -= 1 | while temp > 75:
temp -= 1 | Colon missing after while. | Python |
function handle() {{
return
{{key:'result'}}
}} | function handle() {{
return {{key:'result'}};
}} | Return object on same line. | JavaScript |
if ($z = 47) | if ($z == 47) | Use ==. | Perl |
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